If one boards a ship on Erev Shabbat and establishes it as his place (kinyan shevita), may he sail on Shabbat itself?
Synopsis
When a Jew boards a permitted ship before Shabbat and remains through bein hashmashot (twilight), he establishes the ship as his Shabbat place (kinyan shevita), which permits the ship to sail on Shabbat. Authorities disagree about whether leaving the ship after kinyan invalidates the permission.
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